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The magnet yoke of the ALEPH particle detector is seen in its completed form in early 1987. ALEPH will be one of 4 major detectors at the new LEP (Large Electron- Positron) collider, due to start work in 1989 at CERN, the European particle physics laboratory outside Geneva. ALEPH (Apparatus for LEP pHysics!) will consist of many sub-detectors, including a time projection chamber (TPC) & a lepton calorimeter. The magnet yoke contains 4000 square metres of wire chamber planes forming ALEPH's hadron calorimeter; it measures 6.
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